Johann Christian Bach (5 September 1735 – 1 January 1782) was a composer of the Classical era, the eighteenth child of Johann Sebastian Bach, and the youngest of his eleven sons. Bach was taught by his father and then, after the latter's death, by his half-brother C. P. E. Bach. Bach moved to Italy in 1754, and then to London in 1762, where he became known as the "London Bach". Bach's compositions include eleven operas, as well as chamber music, orchestral music and compositions for keyboard music. In 1764 Bach met Wolfgang Amadeus Mozart, who was eight at the time, and spent five months teaching him composition. He had considerable influence on Mozart, and was later described by scholars as his "only, true teacher".
This portrait of Bach was painted in 1776 by Thomas Gainsborough, as part of a collection started by Bach's former teacher Padre Martini. It now hangs in the National Portrait Gallery, London.Painting: Thomas Gainsborough